ND312T35W - 1200 Amp Circuit Breaker

ND312T35W - 1200 Amp Circuit Breaker

When you’re replacing a breaker in existing equipment, the details have to line up. The ND312T35W is a 1200-amp, 3-pole, Type ND N-Frame molded-case electronic circuit breaker for compatible electrical systems. It measures 16 inches high, 8.25 inches wide, and 5.5 inches deep and is HACR rated. Interrupting capacity varies by system voltage: 25kA at 600VAC, 50kA at 480VAC, and 65kA at 240VAC. Protection functions include adjustable short-time pickup with an I²t short-delay ramp and ground-fault protection. The breaker uses a non-interchangeable trip unit. One thing to keep in mind when matching components: the rating plug and lug terminals are not included in the catalog number. For existing equipment designed around this N-Frame configuration, the ND312T35W provides the dimensions, ratings, and functions needed to evaluate it as a form, fit, and functional replacement. It’s built to last and intended to provide dependable service when correctly matched, installed, and maintained.

Key Features and Benefits

• 1200A, 3-pole design for compatible three-phase electrical systems.
• The N-Frame, Type ND configuration makes it easier to match the breaker to existing equipment that requires this specific frame and type.
• 25kA @ 600VAC, 50kA @ 480VAC, and 65kA @ 240VAC interrupting ratings give you the numbers needed to check the breaker against the application.
• Adjustable short-time pickup provides the specified protection adjustment for compatible systems.
• I²t short-delay ramp is included as part of the breaker’s protection functions.
• This configuration includes ground-fault protection.
• HACR rated for applications that require an HACR-rated breaker, provided the remaining specifications are compatible.
• Non-interchangeable trip unit maintains the intended trip-unit configuration.
  

Technical Specifications

• Part Number: ND312T35W
  
• Type: ND
  
• Frame: N-Frame
  
• Breaker Style: Molded Case Electronic Circuit Breaker
  
• Amperage: 1200A
  
• Poles: 3
  
• A.I.C. Rating @ 600VAC: 25kA
  
• A.I.C. Rating @ 480VAC: 50kA
  
• A.I.C. Rating @ 240VAC: 65kA
  
• Height: 16.0 in.
  
• Width: 8.25 in.
  
• Depth: 5.5 in.
  
• Trip Unit: Non-Interchangeable
  
• Short-Time Pickup: Adjustable
  
• Short Delay: I²t Ramp
  
• Ground-Fault Protection: Yes
  
• HACR Rated: Yes
  
• Rating Plug: Not Included in Catalog Number
  
• Lug Terminals: Not Included in Catalog Number
  

Material Compliance and Certifications

• The supplied specifications identify the ND312T35W as HACR rated. No additional material-compliance information or certification details were provided. For that reason, add specific claims about UL, CSA, RoHS, construction materials, or other certifications only if you can confirm them in applicable product documentation.
  

Where It Works Best

• The ND312T35W makes the most sense in existing N-Frame electrical equipment designed for a Type ND breaker with these ratings and protection functions. That can include compatible commercial, industrial, and HVAC applications.
• For replacement work, start with the basics rather than assuming two breakers are interchangeable because they look alike. Check the frame and breaker type, 1200A rating, three-pole configuration, physical dimensions, system voltage, required A.I.C. rating, trip functions, rating plug, and terminal requirements. If those specifications match the existing equipment requirements, the ND312T35W can be considered a form-, fit-, and functional replacement.